In the 'Administration' drop-down, select 'Modify Printer'; your IP address will be selected, click 'Continue' button; your current printer information will be shown with other options.

Click on the "Select Another Make/Manufacturer"; click "Choose File" button.

Navigate to the file you downloaded "Brother-HL-2170W-hpijs-pcl5e.ppd"

Click 'Modify Printer'.

Click on the 'Maintenance' drop-down and select 'Print Test Page'. Check margins for conformance to the page size selected.

Some simple reminders

Sometimes if you get simple errors like "spool not ready" or "ipp backend failed", there is a good chance you have to resume the printer by selecting the Maintenance drop down and selecting Resume Printer.